Generally, yes, a husband and wife can sleep together during pregnancy. The more nuanced question might be: Is sexual intercourse safe during pregnancy?
Based on the provided reference, having sex won't affect your baby if you don't have health concerns during pregnancy such as preterm labor or placenta problems. The amniotic fluid and strong uterine muscles provide a protective environment for the baby.
Therefore, sexual activity during pregnancy is typically considered safe unless specific medical conditions exist. It's always best to consult with your healthcare provider for personalized advice.